html 
  // font-size: 50px
  line-height: 1.4
  font-size: 50px
  @media screen and (max-width: 320px)
    font-size: (50px / 375 * 320)

body 
  font-size 12px

div, span, header, ul, li, h2, h3, h4, h5, h6, 
nav, main, section, article, input, em, strong, img
  box-sizing: border-box


.flex-1, .spacer
  flex 1

.ipage
  width 100vw
  box-sizing: border-box
  // height: 100vh
  // overflow hidden